CN106317251B - A kind of seaweed chemical environmental protection Calcific technology - Google Patents
A kind of seaweed chemical environmental protection Calcific technology Download PDFInfo
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- CN106317251B CN106317251B CN201610696589.2A CN201610696589A CN106317251B CN 106317251 B CN106317251 B CN 106317251B CN 201610696589 A CN201610696589 A CN 201610696589A CN 106317251 B CN106317251 B CN 106317251B
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- calcification
- caco
- cacl
- sodium alginate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
- C08B37/0084—Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A kind of seaweed chemical environmental protection Calcific technology belongs to environmental protection, chemical technology field, which uses two step calcifications, and the first step is first in CaCO3In the presence of a variety of source exhaust gas that are passed through that treated into solution CO2, the two reaction generation Ca (HCO3)2CaCl in alternative original technique2As sodium alginate calcification agent, then treat that calcification is supplemented part CaCl after a certain period of time2, so as to fully complete secondary calcification reaction.By adding in thereto and Ca2+Etc. amount of substance CaO or Ca (OH)2, form CaCO3Precipitation can be used as calcification agent to carry out secondary reuse.The method of the present invention is with CaCO3CaCl can be reduced as calcification agent2Use, CaCO3Circulating and recovering is precipitated, reduces the consumption of raw materials for production, reduces production cost.The method of the present invention can consume discarded CO2, reduce CO2Discharge, and new ion is not introduced into during decalcification, reduce the cost of subsequent wastewater treatment.
Description
Technical field
The present invention relates to a kind of seaweed chemical environmental protection Calcific technologies, belong to environmental protection, chemical technology field.
Background technology
China is that seaweed chemical produces the first big country, and annual algin yield is about 40,000 tons.Traditional seaweed chemical technique
CaCl is generally used in production process2As the calcification flocculant of alginic glue, sodium alginate is changed into calcium alginate from molten
Flocculation comes out in liquid, which is that easy to operate, flocculating effect is good, it has also become the classical way of seaweed chemical technique.
However, there is the generation of a large amount of NaCl in this method reaction process, it is excessively high to cause water body salinity, it is difficult to carry out subsequent wastewater treatment
And reuse.
Therefore, a kind of novel calcification method how is developed, CaCl can be reduced2Dosage, reduce the throwing of raw materials for production
Enter and cost, and the generation of salinity can be reduced, reduce the processing cost of waste water, be realize the upgrading of seaweed chemical technology one
A key node.
Invention content
The technical problem to be solved in the present invention is to provide a kind of seaweed chemical environmental protection Calcific technologies.Process reform tradition
Seaweed chemical Calcific technology, using two step calcifications, the first step is first in CaCO3In the presence of processing is passed through into solution
The CO of a variety of source exhaust gas afterwards2, the two reaction generation Ca (HCO3)2CaCl that can be in partial alternative original technique2As alginic acid
Sodium calcification agent then treats that calcification is supplemented CaCl after a certain period of time2, so as to fully complete secondary calcification reaction.After calcification
Contain enough HCO in the calcification waste water of generation3 -, by adding in thereto and Ca2+Etc. amount of substance CaO or Ca (OH)2, i.e.,
It can be with Ca therein2+Reaction forms CaCO3It is precipitated out, the CaCO separated3Calcification agent can be used as to carry out secondary reuse.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of seaweed chemical environmental protection Calcific technology, specifically includes following steps：
(1) thin liquid sodium alginate content is rushed in detection, quantitative to add CaCO to rushing in dilute purified glue3, CaCO3Addition
1.0-1.5 times for sodium alginate total amount in glue is measured, the method mixed using high-speed stirred or pipeline makes CaCO3Uniformly divide
It dissipates；
(2) it is passed through CO into step (1) treated solution2, until solution is in thick；
(3) in the case where being sufficiently stirred, CaCl is added in step (2) treated feed liquid2Solution carries out secondary calcification
Reaction makes the abundant calcification of sodium alginate, forms calcium alginate precipitation, CaCl2A concentration of 8-15%, CaCl2Additive amount is alginic acid
0.2-0.5 times of sodium total amount；
(4) after calcification using the modes such as air supporting, filter-cloth filtering or centrifugation detach calcium alginate for subsequent technique, calcification
Waste water is accurate after separating to measure wherein Ca2+Content, and according to Ca2+The CaO or Ca of the amounts of substances such as content addition
(OH)2So that Ca2+It is able to react generation CaCO completely3Precipitation, the CaCO separated3Precipitation is as calcification agent in step (1)
In recycle；
The advantageous effect of the present invention compared with prior art：
1st, the method for the present invention is with CaCO3CaCl can be reduced as calcification agent2Use, and the CaCO of generation can be passed through3
Precipitation forms circulating and recovering, reduces the consumption of raw materials for production, reduces production cost.
2nd, the method for the present invention can consume CO in calcification process2Exhaust gas reduces CO2Discharge has environmental benefit.
3rd, the method for the present invention reduces the introducing of new ion in alginic glue calcification process, reduces traditional chemical precipitation
The influence of too high in salinity in the waste water that method is brought.
4th, the method for the present invention had not only realized the saving of production cost, but also reduced the cost of subsequent wastewater treatment, greatly
Improve the practicability of this method.
Specific embodiment
Technical scheme of the present invention is specifically described in detail with reference to embodiment；
A kind of seaweed chemical environmental protection Calcific technology, includes the following steps：(1) into sodium alginate production process rush it is dilute net
Enough CaCO are added in after change in glue3；(2) enough CO are passed through into step (1) treated solution2, until solution is in thick,
CO2Boiler waste gas and other industrial waste gases can be used in source, but need to ensure its by purified treatment do not contain dust etc. influence it is brown
The impurity of phycocolloid quality；While lead to CO2Side is stirred, until feed liquid is in thick；(3) it is further continued for adding to the solution that step (2) is handled
Add CaCl2Solution is to abundant calcification；(4) detached after calcification calcium alginate for subsequent technique, after calcification waste water is separated
Measure wherein Ca2+Content, and according to Ca2+The CaO or Ca (OH) of the amounts of substances such as content addition2So that Ca2+It is able to completely
Reaction generation CaCO3Precipitation, CaCO3Precipitation is recycled as calcification agent；
Embodiment 1：
Dilute glue 2L, sodium alginate concentration 0.15%, CaCO are rushed for step (1)3Additive amount 3.0g；For step (3)
CaCl2Solution concentration is 15%, additive amount 10mL；For the Ca (OH) of step (4) addition2, additive amount 2.17g；
Dilute glue 2L, wherein sodium alginate concentration 0.15% are rushed in kelp digestion, add CaCO thereto3, additive amount 3.0g,
Homogenous disperse.Enough CO are passed through into solution while stirring2, until solution is in thick.It is further continued for adding 15%CaCl thereto2
Solution 10mL makes its abundant calcification.After calcification filter cloth detach calcium alginate weight in wet base 11.8g, calcification waste water measure after separating
Ca2+Content 585ppm, according to Ca2+The Ca (OH) of the amounts of substances such as content addition2, additive amount 2.17g, reaction generation completely
CaCO3Precipitation, can recycle as calcification agent.
Embodiment 2：Dilute glue 20L, sodium alginate concentration 0.2%, CaCO are rushed for step (1)3Additive amount 56g；For
Step (3) CaCl2Solution concentration is 10%, additive amount 100mL；For the Ca (OH) of step (4) addition2, additive amount is
19.3g；
Dilute glue 20L, wherein sodium alginate concentration 0.2% are rushed in kelp digestion, add CaCO thereto3, additive amount 56g,
Homogenous disperse.Enough CO are passed through into solution while stirring2, until solution is in thick.It is further continued for adding 10%CaCl thereto2
Solution 100mL makes its abundant calcification.Dissolved air flotation obtains calcium alginate weight in wet base 160g after calcification, and calcification waste water measures after separating
Ca2+Content 520ppm, according to Ca2+The Ca (OH) of the amounts of substances such as content addition2, additive amount 19.3g, reaction generation completely
CaCO3Precipitation, can recycle as calcification agent；
Embodiment 3：Dilute glue 20L, sodium alginate concentration 0.25%, CaCO are rushed for step (1)3Additive amount 100g；Needle
To step (3) CaCl2Solution concentration is 8%, additive amount 125mL；For the CaO of the amount of step (4) additive, additive amount
For 14.0g；
Dilute glue 20L, wherein sodium alginate concentration 0.25% are rushed in kelp digestion, add CaCO thereto3, additive amount
100g, homogenous disperse.Enough CO are passed through into solution while stirring2, until solution is in thick.It is further continued for adding 8% thereto
CaCl2Solution 125ml makes its abundant calcification.Centrifuged after calcification calcium alginate weight in wet base 240g, calcification waste water are separated
After measure Ca2+Content 500ppm, according to Ca2+The CaO of the amount of content additive, additive amount 14.0g, completely reaction generation
CaCO3Precipitation, can recycle as calcification agent.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Effect embodiment is applied to the control that there are the liquid, gas of similar requirement in other fields, but every without departing from the technology of the present invention side
Case content, any simple modification, equivalent variations and the remodeling that technical spirit according to the present invention makees above example, still belongs to
In the protection domain of technical solution of the present invention.
Claims (1)
1. a kind of seaweed chemical environmental protection Calcific technology, it is characterised in that it specifically includes following steps：
（1）Sodium alginate content in thin liquid is rushed in detection, quantitative that CaCO is added in thin liquid to rushing3, CaCO3Additive amount is rushes in thin liquid
1.0-1.5 times of sodium alginate total amount, the method mixed using high-speed stirred or pipeline make CaCO3It is homodisperse；
（2）To step（1）CO is passed through in treated solution2, until solution is in sticky or gel；
（3）In the case where being sufficiently stirred, to step（2）Feed liquid that treated adds in CaCl2Solution carries out secondary calcification reaction,
Make the abundant calcification of sodium alginate, form calcium alginate precipitation, CaCl2A concentration of 8-15%, CaCl2Additive amount is sodium alginate total amount
0.15-0.4 times；
（4）After calcification using air supporting, filter-cloth filtering or centrifugation detach calcium alginate for subsequent technique, calcification waste water point
Separate out accurate measure wherein Ca after coming2+Content, and according to Ca2+The CaO or Ca (OH) of the amount of substance such as content addition2So that Ca2 +It is able to react generation CaCO completely3Precipitation, the CaCO separated3Precipitation is as calcification agent in step（1）In recycle.
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| CN106317251B true CN106317251B (en) | 2018-06-19 |
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| CN111848829A (en) * | 2020-07-24 | 2020-10-30 | 张银冰 | Environment-friendly calcification process for seaweed chemical industry |
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